Brake for concrete mixers



July 7, 1925'. A 1,544,841

G. JAEGER I I INVENTOR GEB HARD JAEGER ATTYS.

July 7, 1925" G. JAEGEFZ BRAKE FOR CONCRETE MIXERS 2 Sheets-Sheet 2 Filed Feb, 17, 1923 Fig.2.

INVENTOR GEBHARD JAEGER Patented July 7, 1925 UNHTED srrns 1,544,341 PATENT orrlcs.

GEBHARD IAEGER, OF COLUMBUS, OHIO.

BRAKE FOB- C'ONCRETE MIXERS.

Application filed February 17, 1923. Serial No. 6'19,763.

. To allwlzom it may concern:

Be it known that I, GEBHARD JAEGER, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvement in. Brakes for Concrete Mixers, of which the-following is a specification.

The type of concrete mixing drum that is charged and discharged through a single opening is usually swung from charging to discharging posit-ion and conversely on a supporting cross bar having trunnions. As such a drum is oftentimes very large and heavy the momentum gained in such movement is large. The momentum is especially large if the movement is to be economically rapid and such momentum 'tendsto carry the open end beyond the destined point of charging or discharging. The object of the present invention is to provide an improved and easily operated means for applying a.

retarding friction as the drum approaches the limit of its travel in each direction thereby permitting the drum to swing rapidly in the greater portion of its are of travel.

The invention is embodied in the example herein shown and described, the features of novelty being finally claimed.

In the accompanying drawing- Figure 1 is a View in side elevation with a portion broken out of a concrete mixin apparatus having the invention appli thereto. 1 I

Fig. 2 is a detail in edge View looking .to the right in Fig. 1 showing the braking means andthe portion of drum supporting frame containing said means.

Fig. 3 is a plan view of the plain and bell crank brake strap operating levers removed from the machine.

Fig. 4 is an elevation of the opposite sid of the large sector gear shown in Fig. 1 removed from the apparatus.

In the views 5 designates. the mixing drum having its chargingand discharging open: ing at 5*. This drum is of a form usual in mixing apparatuses of the type described 5 of which is journaled in a bearing 8 secured provided with a lug 20 and the arm can be and has suitable means, not shown, for rotat-' to a suitable frame 9 for the whole apparatus. 1

To oscillate'the drum for the purpose of bringing it to charging or discharging position the trunnion 7 has aflixed to it a large internal sector gear 10 engaged by a pinion 11 on shaft 12 journaled on the frame and turned by a largefly wheel 13 or other suitable means. On the shaft 12 is a brake drum 14 engaged by a brake strap 24.

Journaled in a suitable bracket 25 on'the main frame is the shaft 15.0f a bell crank lever having arms 15 and 15. One end of the brake strap 24 is connected to a cross pin 15 between the forks of the arm 15 of the bell. crank lever while the other end, which has attached to it a threaded stem 24, is passed through the perforated arm of a bracket 16 on the main frame 9, said threaded stem having on its end a nut 17 for shorteningor' lengthening the operating portion of the strap and varying or regulating the braking efiect to be induced by it.

The arm 15 of the bell crank lever has L pivoted to a fiat side thereof. at l8 a long arm 19 that is capable of oscillation on its pivot in a plane parallel to-the axis of the bell crank shaft 15 for the purpose of applying and releasing the brake.- Said arm is j .85 shifted from brake releasin to brake ap- I plying position with one stro e.

The rim of the sector gear has adjustably secured to it at approximatel the limits of its swing lugs 21 and 22 avmg their opposed ends beveled to provide cams to act on the lug 20 as hereinafter described. Either or both of the lugs can be double beveled as shown in the instance of lug 21.

The operation is this:' When the mixing drum is swinging by the operation of the pinion 11 toward the right, that is toward the charging position, as shown in Fig. 1, the arm 19 is swung by the attendant to I bring the lug 20 into the path of movement of the cam 21, as shown in Fig. 2, thereby causing a depression of the arm 19 and an oscillation of the bell crank arm 15 to the left and consequently an application of the brake strap to the brake drum. The effect of this application of the strap is, of course, to check and finally arrest the motion of the drum, it being assumed that the operating portion of the brake strap has been adjusted to produce'the necessary friction. When the mixing drum is swung to the left by a reverse motion of the pinion 11. the arm 19 is swung to bring its lug 20 into the path of motion of the cam 22 and when said cam engages said lug the arm 19 is depressed and the brake strap applied in the manner and with the effect before described. Thus by merely shifting the arm 19 into the path of the proper cam 21 or 22 the mixing drum is easily and promptly arrested at the proper position for charging or discharging without burdensome efl'ort on the part of the attendant. After starting the mixing drum over in either direction with the operating wheel the attendant can let go of that and shove or pull the arm 19 over to operating position, suitable stops, as shown, being present to limit themovement of the said arm to the operating positions.

The forms of the parts 'can be changed.

without departing from the gist of the invention as claimed.

WhatI claim is:

1. The combination with a mixing drum and means for oscillating the same, of a brake drum rotated with the mixing drum, a brake strap ,for the brake drum, a pair of disalined lugs oscillating with the mixing drum, said lugs angularly spaced with reference to the axis of motion of the drum, and shiftable means for alternate operation by said lugs to apply braking pressure to said strap, the spacing of said lugs being such as to apply the braking pressure when the mixing drum approaches each limit of its oscillation.

2. In combination with an oscillating mixing drum of the kind described, a brake drum turning with the mixing drum, a bell crank lever having an arm pivoted to one arm thereof, a brake strap for said drum connected at one end to a fixed point and at the other end to the other arm of said bell crank lever, and two disalined lugs operated with the operation of the mixing drum adapted to act on said pivoted arm to depress that arm and apply braking pressure to the strap on the brake drum when the pivoted arm is moved into the path of movement of either of said lugs.

3. In combination with an oscillating mixing drum of the kind described, a brake drum turning with the mixing drum, a bell crank lever'having an arm pivoted to one arm thereof, a brake strap for said drum connected at one end to a fixed point and at the other to the other arm of said bell crank lever, and two disalined lugs operated with the operation of the mixing drum adapted to act-on said pivoted arm to depress that arm and apply braking pressure to said brake strap when the pivoted arm is moved into the path of movement of either of said lugs, said lugs being located to operate on said pivoted arm and apply said braking pressure when the drum approaches charging and discharging position.

\ GEBHARD JAEGER. 

